I have an old tower, a 900Mhz machine.  It was the first machine I
ever installed Linux on.  I don't know why I never got rid of it, but
I still have it for archiving.

This particular machine has an ATI All In Wonder 8500DV.  It has a TV
out attached to it.  I use it mostly for making VCD video to take on
the go.  Well, the other day, I hooked the cables up to the wrong
input.  Suddenly, during the system boot screen where it checks memory
and so on, the screen changes resolution and size on the monitor.  It
appears it thought it was connected to a TV.

This intrigues me because I was under the impression that the
composite TV Out on video cards runs through a driver (read that:
Windows only).  But with this going to TV resolution as soon as I
switched on the machine, I'm thinking it might be hardware based and
not be software related at all.

The only reason I haven't tried experimenting is that I'm not sure how
risky this is under Linux.  I know setting the resolution cautions to
set the frequencies and such correctly or you could damage the
monitor, and I'm leery of trashing my TV.

So is anyone familiar enough with video cards to know if the switch is
truly hardware based, and would potentially work with DOS if I so
tried it?  If so, do I have to set the display under Linux for
something first before I start it up on the TV?
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